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Slice of star fruit (Carambola) when exposed to...a supermarket. College Station, Texas  
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Slice of star fruit (Carambola) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a supermarket. College Station, Texas, September 3, 2024

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The image presents a comparative display of a star fruit slice under two lighting conditions: regular daylight and UV-A blacklight illumination.

**Upper Image (Daylight)**

* The star fruit slice is positioned centrally within the frame.
* It is illuminated by natural light from above, casting no shadows.
* The fruit's yellow coloration is clearly visible, with some minor blemishes or imperfections along its surface.

**Lower Image (UV-A Blacklight)**

* The star fruit slice occupies a similar central position as in the upper image.
* However, this time it is exposed to UV-A blacklight from below, resulting in an intense blue glow that permeates the entire image.
* The yellow coloration of the fruit has transformed into a vibrant blue hue, with some areas appearing more intensely blue than others.
* The surface of the fruit exhibits no visible blemishes or imperfections under this lighting condition.

**Overall Observation**

The star fruit's appearance changes dramatically when exposed to UV-A blacklight. While it retains its natural yellow coloration in daylight, it transforms into a striking blue hue under UV illumination. This phenomenon is likely due to the presence of fluorescent pigments within the fruit that absorb UV light and emit blue light upon excitation. The contrast between the two images highlights the unique properties of this fruit and its responsiveness to different types of lighting. – AI vision

Un trozo de carambola (fruta estrella) cuando se expone a la luz normal del día y también cuando está iluminado con una luz negra ultravioleta (UV-A) de 365 nm en un supermercado. College Station, Texas, 3 de septiembre de 2024. La imagen presenta una exhibición comparativa de un trozo de fruta estrella bajo dos condiciones de iluminación: luz normal y luz negra UV-A.

**Imagen superior (luz del día)** * El trozo de carambola está ubicado en el centro del marco. * Es iluminado por la luz natural desde arriba, sin lanzar sombras. * La coloración amarilla de la fruta es claramente visible, con algunas manchas o imperfecciones menores a lo largo de su superficie. **Imagen inferior (luz negra UV-A)** * El trozo de carambola ocupa una posición central similar a la imagen superior. * Sin embargo, esta vez está expuesto a luz negra UV-A desde abajo, resultando en un intenso brillo azul que permear toda la imagen. * La coloración amarilla de la fruta se ha transformado en un tono azul vibrante, con algunas áreas que aparecen más intensamente azules que otras. * La superficie del fruto no presenta manchas ni imperfecciones visibles bajo esta condición de iluminación. **Observación General**
La apariencia de la carambola cambia drásticamente cuando se expone a luz negra UV-A. Mientras que conserva su color amarillo natural en la luz del día, se transforma en un tono azul impresionante bajo iluminación UV. Este fenómeno es probablemente debido a la presencia de pigmentos fluorescentes dentro de la fruta que absorben luz UV y emiten luz azul tras excitación. El contraste entre las dos imágenes destaca las propiedades únicas de esta fruta y su capacidad de respuesta a diferentes tipos de iluminación. – Spanish translation


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